iTunes update 26 Jan 2014 failed today in 79GB portion of 117GB update w Apple Installer w msg that it could not complete installation and suggested reload iTunes. On reload (as per Apple error box) iTunes will get as far as trying to load Apple Mobile t

iTunes update 26 Jan 2014 failed today in 79GB portion of 117GB update w Apple Installer w msg that it could not complete installation and suggested reload iTunes. On reload (as per Apple error box) iTunes will get as far as trying to load Apple Mobile then it fails.( W7x64) When unit Rebooted - msg "Runtime C++ lib failed to load". Previous updates have always worked, defaults always selected. Can't determine which version was attempting to load but is 11.x.xx today.